Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 538, Issue -, Pages 99-107Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.11.076
Keywords
Hierarchically porous structure; ZnO/g-C3N4; Heterojunction; Photocatalytic activity; Active species
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Funding
- National Key R&D Program of China [2016YFA0202602]
- National Natural Science Foundation of China [U1663225, 21671155, 21805220]
- Hubei Provincial Natural Science Foundation [2018CFB242]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R52]
- Fundamental Research Funds for the Central Universities [WUT: 2017III001, 2017III055, 2018III039GX, 2018IVA095]
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Graphitic carbon nitride (g-C3N4) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV-Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C3N4 nanosheets. As a result, the 1.5-ZnO/g-C3N4 composite (the mass ratio of zinc acetate dihydrate to g-C3N4 is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C3N4 and pure ZnO. In addition, our results confirm that center dot O-2(-) and h(+) are the main active species for ZnO/g-C3N4 in degradation of RhB. (C) 2018 Elsevier Inc. All rights reserved.
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